nomadseason

September Weather in Glen Ellyn, United States

Last updated: June 24, 2025

In September, the average temperature in Glen Ellyn, United States hovers around 20°C (68°F). You can expect variations with a minimum of 3°C (38°F) and a maximum of 33°C (93°F). During this time, precipitation totals approximately 85 mm (3.3 in) over 9 days, contributing to an average humidity level of 80%.

September Temperature in Glen Ellyn

In September in Glen Ellyn, the average temperature is 20°C (68°F). Maximum temperatures can reach 33°C (93°F), while the minimum can drop to as low as 3°C (38°F). This variation makes Glen Ellyn an ideal destination for travelers seeking diverse weather experiences.

September Weather in Glen Ellyn: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Glen Ellyn, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Glen Ellyn, September typically has an average temperature of 20°C (68°F), with highs reaching up to 33°C (93°F) and lows dropping to around 3°C (38°F).
JanFebMarAprMayJunJulAugSepOctNovDec262839475971757367543933
Data source: Temperature data for Glen Ellyn generated using information from the Copernicus Climate Change Service.
Choose your preferred temperature unit
The average of daily temperatures (24 hours) calculated across all days in the month.

September Precipitation in Glen Ellyn

In Glen Ellyn in September, the precipitation amount is 85 mm (3.3 in) over the course of 9 days.

September Precipitation Trends in Glen Ellyn

The chart displays monthly precipitation patterns in Glen Ellyn, with values for each month alongside September’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how September’s conditions compare to those of other months. In Glen Ellyn, September typically receives around 85 mm (3.3 inches) of precipitation spread over approximately 9 days.
JanFebMarAprMayJunJulAugSepOctNovDec61607911516413410592851275553
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
Choose your preferred precipitation unit

September Humidity in Glen Ellyn

In Glen Ellyn in September, humidity is 80%. With an average temperature of 20°C (68°F), this humidity feels like traveling through a warm, dense blanket that clings to your skin, making you feel both sticky and lethargic as you explore the sights.

September Average Humidity in Glen Ellyn

This chart illustrates the average monthly humidity levels in Glen Ellyn, with September’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In September, average humidity in Glen Ellyn is approximately 80%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec82%83%84%85%79%82%80%81%80%82%88%84%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Glen Ellyn

In Glen Ellyn in September, the maximum UV index is 8, which corresponds to a very high Exposure Category. This means that the time to burn is only 15 minutes. For more detailed information, you can refer to the Hourly UV Index in Glen Ellyn.

Maximum UV Index Levels in Glen Ellyn for September

The chart shows the monthly maximum UV Index (UVI) for Glen Ellyn in September, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues. In September, the maximum UV index in Glen Ellyn typically reaches 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec34689101098632
Data source: Glen Ellyn September UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

  •  Extreme (11+): Avoid the sun, stay in shade.
  •  Very High (8-10): Limit sun exposure.
  •  High (6-7): Use SPF 30+ and protective clothing.
  •  Moderate (3-5): Midday shade recommended.
  •  Low (0-2): No protection needed.

How September Weather in Glen Ellyn Compares to Other Months

Weather in Glen Ellyn varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Glen Ellyn, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in Glen Ellyn, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-4°C (26°F)61 mm (2.4 inches)82%moderate
February Weather-2°C (28°F)60 mm (2.4 inches)83%moderate
March Weather4°C (39°F)79 mm (3.1 inches)84%high
April Weather9°C (48°F)115 mm (4.5 inches)85%very high
May Weather15°C (60°F)164 mm (6.4 inches)79%very high
June Weather21°C (71°F)134 mm (5.3 inches)82%very high
July Weather24°C (75°F)105 mm (4.1 inches)80%very high
August Weather23°C (73°F)92 mm (3.6 inches)81%very high
September Weather20°C (68°F)85 mm (3.3 inches)80%very high
October Weather12°C (54°F)127 mm (5.0 inches)82%high
November Weather4°C (39°F)55 mm (2.2 inches)88%moderate
December Weather0°C (33°F)53 mm (2.1 inches)84%low

Compare Glen Ellyn's Climate with Cities Worldwide